And david matthew



A. CAMERON e D. MATTHEW.

RAILROAD WHEEL.

Patented Sept. 6. 1859.

UNTTET) STATES PATENT OFFTCE.

ARCH. CALERON, OF CHARLESTON, SOUTH CAROLINA, AND DAVID MATTHEW, OFPHILADELPHIA, PENNSYLVANIA.

RAILROAD-WHEEL.

Specification of Letters Iatent No. 25,317, dated September 6, 1859` Toall whom fit may concern:

Be it known that we, ARCHIBALD CAME- RON, of t-he city of Charleston andState of South Carolina, and DAvD MATTHEW, of the city of Philadelphiaand State of Pennsylvania, have jointly invented a new and usefulImprovement in RailrOad-VheelS, and that the following is a full, clear,and exact description of the same, reference being had to theaccompanying` drawing and the letters of reference thereon.

The nature of our invention consists in the formation of a rail road carwheel, substantially as hereinafter described.

In t-he accompanying drawing Figure 1 is a front view of the wheel, Fig.2 is a section through line Fig. l.

A is the periphery or tread, B B the arms, C the hub, e e hole in armsor spokes.

The manner we construct our improved elastic armed rail road wheel is tomold the wheel pattern, in the usual way, the pattern being placed inchill mold, and ask, after the usual application, of molders tools, andwork Of molding, and the pattern in the mold, the pattern being removed,the arms being prepared, and in proper form, having been coated on theends, with a flux of such a nature, as to make the fluid metal Howfreely over them, and to unite, and adhere to it, and having the endspierced with holes, to allow the metal to flow through, and unitethrough the arms, the arms having been properly prepared, and the moldbeing ready, the arms are put into a heater, and heated, and then theyare placed, and secured, the metal being ready, the periphery or tread Ais poured or cast., and in the course of 10 to 2O minutes time, the hubis poured or cast, this time is to be varied, in proportion to thethickness of the periphery, and its diameter.

The following is the properties, obtained by this improved, combinationin car wheels. The chill Of the tread, is more uniform, and the tread,is cast of iron most suitable. The tread being chilled without anystrain from other parts of the wheel, as is in other wheels, thereforehas no straining of metal. The arms being curved, they are tightened bythe shrinking of the hub, and yield to its requirements, this shrinkageon hub is cast of iron most suitable for it. The

wheel possesses elasticity, between hub and periphery, and relieves therail from that crushing, rigidness of the common wheel, which is sodestructive to rail, and rail joints On which they run. This Wheelpossesses elasticity, between hub and periphery, which adds materiallyto the protection of the shaft journal and bearings. This wheelpossesses the properties of the spring, and transmits its benefit-s tothe rail, bridges, shafts, journals and bearings.

Having thus fully described the manner we construct our improved carwheel, and the properties which it possesses, 1st, we do not claimcombining curved wrought iron arms with cast hub, and cast chilledtread, when the arms, are secured thereto by keying them, in betweendove tail lugs into the chilled tread, or periphery, 2nd, nor the curvedarms, when the arms form a periphery for the support of a tread formedof a single ring, shrunk, or put on in any other manner separate fromthe arms with the hub cast on the arms, 3d, nor combining of wroughtiron arms, with, cast hub, and rim, when the arms are straight, and notmade to yield to the shrinkage and blows from rail joints, or otherirregularities of the rails, 4th, nor do We claim the casting, of therim first and allowing it to become quite cold, before casting, the hub,on straight wrought iron arms, as this has not the desired effect, nordo we Wish to be understood, as claiming such, but

lVhat we claim and desire to secure by Letters Patent, is-

The peculiar construction of car wheels, having elastic curved arms B,with chilled cast tread A, and cast hub C, forming one combined wheel,substantially, as herein set forth.

ARCHD. CAMERON. DAVID MATTHEW.

lVitnesses:

Jos. JOHNSON, Jr., CHARLES D. FREEMAN.

